Search-light.



K. KLEtNERT.

SEARCH LIGHT.

APPLICATION FILED NOV. 29. 1915.

Patented Feb. 25, 1919.

UNITED STATES PATENT OFFICE.

KARL KLEINERT, OF STUTTGART, GERMANY, ASSIG-NOR, BY MESNE ASSIGNMENTS, TO AMERICAN BOSCH MAGNETO CORPORATION, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

SEARCH-LIGHT.

Specifics tion of Letters Patent.

Patented Feb. 25, 1919.

Application led November 29, 1915. Serial No. 63,949.

To all whom t lmay concern:

Be it known that I, KARL KLEINERT, engineer, a subject of theEmperor of Austria- Hungary, residing at Stuttgart ,57, Traubenstrasse, Germany, have invented certain new and useful Improvements in Search- Lights; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to reflector lamps, and more particularly to headlights for use on automobiles, motor boats, and the like, and the main objects of the invention are to provide a reflector lamp devoid of the dazzling effect common to most headlights at present in use, and an incandescent lamp for combination with a reflector for that purpose.

In those reflector lamps which are provided with a powerful lamp and with a reflector composed of dissimilar surfaces of revolution, a glaring image of the filament is reproduced in the reflector, and in consequence thereof, the dazzling effect of the reflector lamp surpasses its lighting capacity proper. In order to obviate the dazzling effect, lamp bulbs dulled all over, or at least over their front part, have been employed, but while the dazzling eect was decreased, the lighting capacity of the reflector lamp was very materially reduced.

In accordance with this invention, the dazzling effect of the reflector lamp is reduced Without materially impairin the lighting power of the lamp. Th1s is e ected by providing a bulb surrounding the source of light with a translucent or half-dulled continuous band on its front part, and pref erably associating the bulb with a reflector composed of surfaces of revolution of a small parabola and a large parabola connected by an intermediate spherical zone. The translucent or half-dulled band prevents the formation of an image of the source of light in the reflector. The rays meetin the s herical zone of the reflector are re ected ack through the source of light, and after combining with the rays oppositel directed from the source of light,

ass t rough the translucentI band to the orward part of the reflector formed by the larger paraboloidal surface. The rear part of the reflector, formed by the smaller paraboloidal surface, projects a part of the rays through the translucent band, and another but preferably a smaller part of the rays therefrom are projected along the path of the rays proceeding directly from the source of light through the extreme forward transparent part of the lamp bulb. In consequence thereof, the reflector lamp gives the appearance of a uniformly luminous globe of much lighting power, but without any dazzling effect whatsoever.

In the accompanying drawings illustrate ing the preferred form of the reflector lamp in accordance with this invention, Figure 1 is a longitudinal section, and Fig. 2 is a front elevation of the reflector lamp.

In the reflector formed of the combination of the surfaces of revolution of a small parabola g and a large parabola d, and with an intermediate spherical zone connecting the two, there is fixed an incandescent lamp a having a spherical bulb of comparatively large diameter and extending close to the rear surfaces g and e of the reflector. AThe bulb is provided on its front part with a translucent or half-dulled spherical zone I), formed by a ring terminating in parallel planes substantially perpendicular to the axis of the lamp, while the rest of the bulb, including the portion a behind the zone b and also the portion c in front of the zone b and extending over the extreme front of the bulb, as shown, is transparent. The translucent band b is sufficiently large to allow all the rays meeting the front paraboloidal surface d of the reflector to pass through it and to prevent the image of the lamp filament from being reproduced on that part of the reflector. Those rays are combined with the rays which strike the spherical surface e of the reflector and are reflected through the focus f of the lamp and through the translucent band b. Most of the rays striking the paraboloidal surface g ofthe reflector are projected through the translucent band b, and only those rays which are projected forwardly through the transparent portion a of the bulb combined with the rays reflected from the innermost part of the surface g are projected from the reflector lamp without bemg intercepted by the translucent zone b. By this arrangement, the lamp assumes the appearance of a uniformly luminous globe, and the dazzling effect of the filament-image glaringly reproduced on the reflector is obviated Without materially irnpairing the lighting power of the reflector lamp.

Having thus described my invention, what I claim-is:

l. In a reflector lamp, a reflector, a souce of light, and a bulb surrounding the source of light and having transparent and translucent portions, the source of light, the bulb and the reflector bein so constructed and arranged that-substantially all of the unreflected rays are projected from the source of light directly through a transparent p0rtion of the bulb.

2. In a reflector lamp, a reflector, a source of light, and a bulb surrounding the source of light and having transparent and translucent portions, the source of light, the bulb and the reflector being so constructed and arranged that substantially all of the reflected rays passI through the translucent portions before leaving the lamp, Whereas substantially all the unreflected rays are projected from the source of light directly through a transparent portion of the bulb.

3. In a reflector lamp, a reflector composed of dissimilar surfaces of revolution, a source of light, and a bulb surrounding the source of light and having transparent and translucent portions, the source of light, the bulb and the reflector being so constructed and arranged that substantially all of the reflected rays pass throughy the translucent portion before leaving the lamp, Whereas substantially all of the unreflected rays are projected from the source of light directly through a transparent portion of the bulb.

4. In a reflector lamp, a reflector composed of paraboloidal surfaces connected by a spherical surface, a source of light, a globe surrounding the source of light and having a continuous translucent band bounded by transparent portions, the source of light, tne bulb and the reflector being so constructed and arranged that substantially all of the rays from the source of light to the front parafboloidal surface pass through the translucent band, that substantially all of the rays from the source of light to the rear paraboloidal surface pass through the rear transparent portion of the bulb and are in part projected from that surface through the translucent band, and that substantially all of the unreflected rays are projected directly from the source of light through the front transparent portion of the bulb.

5. In a reflector lamp, a reflector composed yof dissimilar surfaces of revolution, includ.

ing an intermediate spherical zone, a source of light, and a bulb surrounding the source of light and having a translucent band around the bulb and extending forwardly of the spherical Zone of the reflector.

6. Ina reflector lamp, a reflector composed of dissimilar surfaces of revolution, a source of light, and a bulb surrounding the source of light, said bulb having a continuous translucent band on its front part bordered at the rear by a-transparent portion and at the front by a transparent portion extending over the eXtreme front surface of the bulb.

7 In a reflector lamp, a reflector composed of the surfaces of revolution of a large and a small parabola and of a spherical zone connecting said surfaces, a source, of light, and a bulb surrounding the source of light and having a band on its front part of less transparency than the rest of the bulb.

8. In a reflector lamp, a reflectorcomposed of the surfaces of revolution of a large and a small parabola and a spherical zone .conn ecting said surfaces, a source of light, and a bulb surrounding the source of light and having a band on its front part of less transparency than the rest of the bulb, said band extending forwardly of the spherical zone and intercepting substantially all the reflected rays before they leave the lamp.

9. For combination with a headlight reflector, of an incandescent lamp With a sperical bulb having a continuous translucent band extending around the front part of the bulb and terminating in parallel planes substantially' perpendicular to the axis of the v lamp and also having a zone of clear glass behind the band, and another zone of clear glass in front of the band. and over the veX- treme front of the bulb; substantially as and for the purpose described.

In testimony whereof I have affixed my signature in presence of two Witnesses.

v KARL KLEINERT. Witnesses:

ADoLF LEBBERS, PAUL WOLEART. 

